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(No Model.) 2 Sheets-Sheet 1.

- L, ATKINSON.- TELEGRAPH BEPEATER.

No, 464,001. Patented Dec. 1, I891.

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(No Model.) 2 sheets-sheet 2.

R. L. ATKINSON. TELEGRAPH REPEATER.

No. 464,001. Patented Dec. 1,1891;

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L'ast f mllnmun I l l l v WITNESSES: IIVV TOR "'nurlmmm Wm! M 2 f dgfi MI! I!!! NITED STATE PATENT OFFICE.

RICHARD L. ATKINSON, OF DELAIVARE TOlV NSI-IIRNEIV JERSEY, ASSIGNOR TO JOHN D. TUSTIN, OF SAME PLACE.

TELEG RAPH- REP-EATER.

SPECIFICATION forming part of Letters Patent No. 464,001, dated December 1, 1891.

Application filed March 27,1891. Serial No. 386.632. (No model.)

To aZZ whom it may concern:

Be it known that I, RICHARD L. ATKINSON, a citizen of the United States, residing in Delaware township, in the county of Camden and State of New Jersey, have invented certain new and useful Improvements in Telegraph-Repeaters, of which the following is a specification.

My invention relates to improvements in telegraphic repeaters, and is designed especially to cure a fault in the operation of the repeater described in United States Letters Patent No. 66,945, granted to Brownson and Shull July 23, 1867.

My invention consists in placing a singlepoint relay, or what is commonly known as a bug-trap, in the cut-off circuits described in said patent.

In the accompanying drawings, Figure 1 represents the apparatus and circuits shown in the said patent. Fig. 2 represents substantially the same with my improved apparatus added thereto. Fig. 3 represents the same as shown in Fig. 2, except that a singlecurrent transmitter is substituted for the transmitter shown in Fig.2.

Referring to Figs. 2 and 3 of the drawings by letter, A and B represent, respectively, the east and west relays. A and B respectively represent the east and west transmitters, whose circuits are controlled, respectively, by the relays. A and B represent single-point relays, whose magnets are in a circuit controlled, respectively, by the transmitters, and the points 01 d, which these relays control, are the terminals, respectively, of what are termed in the said Letters Patent the cutoff wires. In Fig. 2 these wires are represented by 76 k and 7c 70.

Referring to Fig. 2, the circuits are as follows: Main line east through relay A to points a on transmitter B to ground. This circuit is duplicated between relay B and transmitter A. b b and b b represent, respectively, the wires of the local circuits, including the represent, respectively, the two cut-off Wires or derived circuits controlled, respectively,

'two local circuits bl) and 12 b as shown.

by the points of the relays A and B at d (1. These wires of each cut-off circuit are connected, respectively, with the wires of the' I will now explain the operation of the patented repeater shown in Fig. 1 and then the operation of my repeater. In the drawing of the patented repeater the condition of the circuits is that when both lines are open. Suppose now that east closes. Relay A closes its local circuit, causing transmitter A to close the circuit of west relay at the point a. Simultaneously the circuit of the cutoff wire k 70 is opened at 6. Now the function of this cut-off circuit 1c is to hold the circuit of the transmitter B closed while the points of the west repeater are open, so that the east line may be complete at a.- As soon, however, as the west relay-points are 70 closed the circuit 7t It may open and the transmitter B will continue to be closed; but in the operation of this repeater it is found that, owing to the length of time which it requires to energize the receiving or, in this instance, the west relay and the additional time it requires for its armature to pass to its frontstop, there is a short space of time when both the cut-off circuit 70 k and the 10- cal circuit 1) b are open, and during this short time the transmitter B, being de-energized, makes a quick break at a and causes a kick in the east relay A. Ihis defect is particularly noticeable on long lines and Where high adjustments are maintained. My invention cures this defect in the following manner: When the transmitter A closes at a, it simultaneously breaks the circuitc c at c and de-energizes the relay or bug-trap A This de-energization of the bug-trap takes 0 place, then, simultaneously with the energization of the west relay B, and as I construct the relays A and B so that they will act sluggishly, or even with the same speed as the main relays, the circuit lo 70 is not opened 5 until the points of the relay B have had time to close, thus insuring that the local circuit b b and the east' line are held closed. These bug-traps inserted in the cut-off circuits therefore act in the nature of cushions [O0 to delay the opening of the said cut-off circuits.

In Fig. 3 I have shown sin gle-current transmitters in the place of those shown at A and 13 in Fig. 2. These are illustrated simply to show that any kind of an instrument which will open one circuit and close another simultaneously may be used in connection with my improved repeater.

Having thus described my invention, I claim 1. In a telegraph-repeater, a local circuit, as b b, and a cut-01f or derived circuit, as it 7i:,in combination wvith a main relay and a second relay, as A the main relay controlling the local circuit and the second relay controlling the cut-ofl or derived circuit, and a second local circuit, as 12 b including the instrument which controls the circuit of said second relay.

2. In a telegraph repeater, a local circuit, as b b, and a cut-off or derived circuit, as 71; 7c, in combination with a main relay and a second relay, as A the main relay controlling the local circuit and the second relay con trolling the cut-off or derived circuit, and a second local circuit, as b 19 including the instrument which controls the circuit of said second relay and at the same operation controls the circuit of said main relay.

In witness whereof I hai e hereunto signed my name in the presence of two subscribing witnesses.

RICHARD L. ATKINSON.

\Vitnesses:

FRANK S. OBER, WM. A. ROSENBAUM. 

